# 格式化字符串1
# (1) % 占位符
name = 'YHSimon'
age = 21
print('我是%s,今年%d岁' % (name, age))

# (2) {}
print('我是{0},今年{1}岁'.format(name, age))

# (3) f-string
print(f'我叫{name},今年{age}岁')
